Rust, pitted
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===Removing the rust in the pits=== | ===Removing the rust in the pits=== | ||
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First, all visible rust must be removed using one or more of the methods listed below. | First, all visible rust must be removed using one or more of the methods listed below. | ||
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*Let naval jelly sit on the area, overnight if possible. Cover it with plastic wrap to keep it from drying out. | *Let naval jelly sit on the area, overnight if possible. Cover it with plastic wrap to keep it from drying out. | ||
*If it's practical to remove and soak the panel or part, there is also the option of using electrolysis for rust removal or using one of several products that require a rusted part to be completely immersed. | *If it's practical to remove and soak the panel or part, there is also the option of using electrolysis for rust removal or using one of several products that require a rusted part to be completely immersed. | ||
| − | * Another alternative is to use | + | * Another alternative is to use phosphoric acid. It is readily available at home centers such as Home Depot under the brand name Phosphoric Plus. It may be brushed on or a part may be soaked in the solution. Heavy pitting will take multiple applications with some wire brushing in between to speed the process. The chemical reaction of the phosphoric acid with iron oxide produces black, water-soluble iron phosphate, which can be scrubbed off. A follow up passivating treatment containing zinc phosphate, such as PPG DX520, can be used to prevent flash rusting. Phosphoric acid rust-removing products may or may not contain zinc phosphate, so read labels and directions carefully. |
====Removal with heat==== | ====Removal with heat==== | ||
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